"Mon, 09 Feb 1970 18:15:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700209
Only TIME
18:15:40
General datetime
1970-02-09 18:15:40Z
For Database
1970-02-09 18:15:40
For HTTP1.1
Mon, 09 Feb 1970 18:15:40 GMT